/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 Module:       FGMSIS.cpp
 Author:       David Culp
               (incorporated into C++ JSBSim class hierarchy, see model authors below)
 Date started: 12/14/03
 Purpose:      Models the MSIS-00 atmosphere

 ------------- Copyright (C) 2003  David P. Culp (davidculp2@comcast.net) ------

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 details.

 You should have received a copy of the GNU Lesser General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place - Suite 330, Boston, MA  02111-1307, USA.

 Further information about the GNU Lesser General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------
Models the MSIS-00 atmosphere. Provides temperature and density to FGAtmosphere,
given day-of-year, time-of-day, altitude, latitude, longitude and local time.

HISTORY
--------------------------------------------------------------------------------
12/14/03   DPC   Created
01/11/04   DPC   Derived from FGAtmosphere

 --------------------------------------------------------------------
 ---------  N R L M S I S E - 0 0    M O D E L    2 0 0 1  ----------
 --------------------------------------------------------------------

 This file is part of the NRLMSISE-00  C source code package - release
 20020503

 The NRLMSISE-00 model was developed by Mike Picone, Alan Hedin, and
 Doug Drob. They also wrote a NRLMSISE-00 distribution package in
 FORTRAN which is available at
 http://uap-www.nrl.navy.mil/models_web/msis/msis_home.htm

 Dominik Brodowski implemented and maintains this C version. You can
 reach him at devel@brodo.de. See the file "DOCUMENTATION" for details,
 and check http://www.brodo.de/english/pub/nrlmsise/index.html for
 updated releases of this package.
*/

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#include "FGMSIS.h"
#include "models/FGAuxiliary.h"
#include <cmath>          /* maths functions */
#include <iostream>        // for cout, endl

using namespace std;

namespace JSBSim {

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
EXTERNAL GLOBAL DATA
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

  /* POWER7 */
  extern double pt[150];
  extern double pd[9][150];
  extern double ps[150];
  extern double pdl[2][25];
  extern double ptl[4][100];
  extern double pma[10][100];
  extern double sam[100];

  /* LOWER7 */
  extern double ptm[10];
  extern double pdm[8][10];
  extern double pavgm[10];

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/


MSIS::MSIS(FGFDMExec* fdmex) : FGAtmosphere(fdmex)
{
  Name = "MSIS";

  for (int i=0; i<9; i++) output.d[i] = 0.0;
  for (int i=0; i<2; i++) output.t[i] = 0.0;

  dm04 = dm16 = dm28 = dm32 = dm40 = dm01 = dm14 = dfa = 0.0;

  for (int i=0; i<5; i++) meso_tn1[i] = 0.0;
  for (int i=0; i<4; i++) meso_tn2[i] = 0.0;
  for (int i=0; i<5; i++) meso_tn3[i] = 0.0;
  for (int i=0; i<2; i++) meso_tgn1[i] = 0.0;
  for (int i=0; i<2; i++) meso_tgn2[i] = 0.0;
  for (int i=0; i<2; i++) meso_tgn3[i] = 0.0;

  Debug(0);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

MSIS::~MSIS()
{
  Debug(1);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bool MSIS::InitModel(void)
{
  unsigned int i;

  flags.switches[0] = 0;
  flags.sw[0] = 0;
  flags.swc[0] = 0;
  for (i=1;i<24;i++) {
    flags.switches[i] = 1;
    flags.sw[i] = 1;
    flags.swc[i] = 1;
  }

  for (i=0;i<7;i++) aph.a[i] = 100.0;

  // set some common magnetic flux values
  input.f107A = 150.0;
  input.f107 = 150.0;
  input.ap = 4.0;

//  UseInternal();

//  SLtemperature = intTemperature = 518.0;
//  SLpressure    = intPressure = 2116.7;
//  SLdensity     = intDensity = 0.002378;
//  SLsoundspeed  = sqrt(2403.0832 * SLtemperature);

  return true;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bool MSIS::Run(bool Holding)
{
  if (FGModel::Run(Holding)) return true;
  if (Holding) return false;

  double h = FDMExec->GetPropagate()->GetAltitudeASL();

  //do temp, pressure, and density first
  //if (!useExternal) {
    // get sea-level values
    Calculate(FDMExec->GetAuxiliary()->GetDayOfYear(),
              FDMExec->GetAuxiliary()->GetSecondsInDay(),
              0.0,
              FDMExec->GetPropagate()->GetLocation().GetLatitudeDeg(),
              FDMExec->GetPropagate()->GetLocation().GetLongitudeDeg());
    SLtemperature = output.t[1] * 1.8;
    SLdensity     = output.d[5] * 1.940321;
    SLpressure    = 1716.488 * SLdensity * SLtemperature;
    SLsoundspeed  = sqrt(2403.0832 * SLtemperature);

    // get at-altitude values
    Calculate(FDMExec->GetAuxiliary()->GetDayOfYear(),
              FDMExec->GetAuxiliary()->GetSecondsInDay(),
              h,
              FDMExec->GetPropagate()->GetLocation().GetLatitudeDeg(),
              FDMExec->GetPropagate()->GetLocation().GetLongitudeDeg());
    //intTemperature = output.t[1] * 1.8;
    //intDensity     = output.d[5] * 1.940321;
    //intPressure    = 1716.488 * intDensity * intTemperature;
    //cout << "T=" << intTemperature << " D=" << intDensity << " P=";
    //cout << intPressure << " a=" << soundspeed << endl;
  //}

  Debug(2);

  return false;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::Calculate(int day, double sec, double alt, double lat, double lon)
{
  input.year = 2000;
  input.doy = day;
  input.sec = sec;
  input.alt = alt / 3281;  //feet to kilometers
  input.g_lat = lat;
  input.g_long = lon;

  input.lst = (sec/3600) + (lon/15);
  if (input.lst > 24.0) input.lst -= 24.0;
  if (input.lst < 0.0) input.lst = 24 - input.lst;

  gtd7d(&input, &flags, &output);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


void MSIS::UseExternal(void){
  // do nothing, external control not allowed
}


//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


void MSIS::tselec(struct nrlmsise_flags *flags)
{
  int i;
  for (i=0;i<24;i++) {
    if (i!=9) {
      if (flags->switches[i]==1)
        flags->sw[i]=1;
      else
        flags->sw[i]=0;
      if (flags->switches[i]>0)
        flags->swc[i]=1;
      else
        flags->swc[i]=0;
    } else {
      flags->sw[i]=flags->switches[i];
      flags->swc[i]=flags->switches[i];
    }
  }
}


//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::glatf(double lat, double *gv, double *reff)
{
  double dgtr = 1.74533E-2;
  double c2;
  c2 = cos(2.0*dgtr*lat);
  *gv = 980.616 * (1.0 - 0.0026373 * c2);
  *reff = 2.0 * (*gv) / (3.085462E-6 + 2.27E-9 * c2) * 1.0E-5;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::ccor(double alt, double r, double h1, double zh)
{
/*        CHEMISTRY/DISSOCIATION CORRECTION FOR MSIS MODELS
 *         ALT - altitude
 *         R - target ratio
 *         H1 - transition scale length
 *         ZH - altitude of 1/2 R
 */
  double e;
  double ex;
  e = (alt - zh) / h1;
  if (e>70)
    return exp(0.0);
  if (e<-70)
    return exp(r);
  ex = exp(e);
  e = r / (1.0 + ex);
  return exp(e);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::ccor2(double alt, double r, double h1, double zh, double h2)
{
/*        CHEMISTRY/DISSOCIATION CORRECTION FOR MSIS MODELS
 *         ALT - altitude
 *         R - target ratio
 *         H1 - transition scale length
 *         ZH - altitude of 1/2 R
 *         H2 - transition scale length #2 ?
 */
  double e1, e2;
  double ex1, ex2;
  double ccor2v;
  e1 = (alt - zh) / h1;
  e2 = (alt - zh) / h2;
  if ((e1 > 70) || (e2 > 70))
    return exp(0.0);
  if ((e1 < -70) && (e2 < -70))
    return exp(r);
  ex1 = exp(e1);
  ex2 = exp(e2);
  ccor2v = r / (1.0 + 0.5 * (ex1 + ex2));
  return exp(ccor2v);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::scalh(double alt, double xm, double temp)
{
  double g;
  double rgas=831.4;
  g = gsurf / (pow((1.0 + alt/re),2.0));
  g = rgas * temp / (g * xm);
  return g;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::dnet (double dd, double dm, double zhm, double xmm, double xm)
{
/*       TURBOPAUSE CORRECTION FOR MSIS MODELS
 *        Root mean density
 *         DD - diffusive density
 *         DM - full mixed density
 *         ZHM - transition scale length
 *         XMM - full mixed molecular weight
 *         XM  - species molecular weight
 *         DNET - combined density
 */
  double a;
  double ylog;
  a  = zhm / (xmm-xm);
  if (!((dm>0) && (dd>0))) {
    cerr << "dnet log error " << dm << ' ' << dd << ' ' << xm << ' ' << endl;
    if ((dd==0) && (dm==0))
      dd=1;
    if (dm==0)
      return dd;
    if (dd==0)
      return dm;
  }
  ylog = a * log(dm/dd);
  if (ylog<-10)
    return dd;
  if (ylog>10)
    return dm;
  a = dd*pow((1.0 + exp(ylog)),(1.0/a));
  return a;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::splini (double *xa, double *ya, double *y2a, int n, double x, double *y)
{
/*      INTEGRATE CUBIC SPLINE FUNCTION FROM XA(1) TO X
 *       XA,YA: ARRAYS OF TABULATED FUNCTION IN ASCENDING ORDER BY X
 *       Y2A: ARRAY OF SECOND DERIVATIVES
 *       N: SIZE OF ARRAYS XA,YA,Y2A
 *       X: ABSCISSA ENDPOINT FOR INTEGRATION
 *       Y: OUTPUT VALUE
 */
  double yi=0;
  int klo=0;
  int khi=1;
  double xx=0.0, h=0.0, a=0.0, b=0.0, a2=0.0, b2=0.0;
  while ((x>xa[klo]) && (khi<n)) {
    xx=x;
    if (khi<(n-1)) {
      if (x<xa[khi])
        xx=x;
      else
        xx=xa[khi];
    }
    h = xa[khi] - xa[klo];
    a = (xa[khi] - xx)/h;
    b = (xx - xa[klo])/h;
    a2 = a*a;
    b2 = b*b;
    yi += ((1.0 - a2) * ya[klo] / 2.0 + b2 * ya[khi] / 2.0 + ((-(1.0+a2*a2)/4.0 + a2/2.0) * y2a[klo] + (b2*b2/4.0 - b2/2.0) * y2a[khi]) * h * h / 6.0) * h;
    klo++;
    khi++;
  }
  *y = yi;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::splint (double *xa, double *ya, double *y2a, int n, double x, double *y)
{
/*      CALCULATE CUBIC SPLINE INTERP VALUE
 *       ADAPTED FROM NUMERICAL RECIPES BY PRESS ET AL.
 *       XA,YA: ARRAYS OF TABULATED FUNCTION IN ASCENDING ORDER BY X
 *       Y2A: ARRAY OF SECOND DERIVATIVES
 *       N: SIZE OF ARRAYS XA,YA,Y2A
 *       X: ABSCISSA FOR INTERPOLATION
 *       Y: OUTPUT VALUE
 */
  int klo=0;
  int khi=n-1;
  int k;
  double h;
  double a, b, yi;
  while ((khi-klo)>1) {
    k=(khi+klo)/2;
    if (xa[k]>x)
      khi=k;
    else
      klo=k;
  }
  h = xa[khi] - xa[klo];
  if (h==0.0)
    cerr << "bad XA input to splint" << endl;
  a = (xa[khi] - x)/h;
  b = (x - xa[klo])/h;
  yi = a * ya[klo] + b * ya[khi] + ((a*a*a - a) * y2a[klo] + (b*b*b - b) * y2a[khi]) * h * h/6.0;
  *y = yi;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::spline (double *x, double *y, int n, double yp1, double ypn, double *y2)
{
/*       CALCULATE 2ND DERIVATIVES OF CUBIC SPLINE INTERP FUNCTION
 *       ADAPTED FROM NUMERICAL RECIPES BY PRESS ET AL
 *       X,Y: ARRAYS OF TABULATED FUNCTION IN ASCENDING ORDER BY X
 *       N: SIZE OF ARRAYS X,Y
 *       YP1,YPN: SPECIFIED DERIVATIVES AT X[0] AND X[N-1]; VALUES
 *                >= 1E30 SIGNAL SIGNAL SECOND DERIVATIVE ZERO
 *       Y2: OUTPUT ARRAY OF SECOND DERIVATIVES
 */
  double *u;
  double sig, p, qn, un;
  int i, k;
  u=new double[n];
  if (u==NULL) {
    cerr << "Out Of Memory in spline - ERROR" << endl;
    return;
  }
  if (yp1>0.99E30) {
    y2[0]=0;
    u[0]=0;
  } else {
    y2[0]=-0.5;
    u[0]=(3.0/(x[1]-x[0]))*((y[1]-y[0])/(x[1]-x[0])-yp1);
  }
  for (i=1;i<(n-1);i++) {
    sig = (x[i]-x[i-1])/(x[i+1] - x[i-1]);
    p = sig * y2[i-1] + 2.0;
    y2[i] = (sig - 1.0) / p;
    u[i] = (6.0 * ((y[i+1] - y[i])/(x[i+1] - x[i]) -(y[i] - y[i-1]) / (x[i] - x[i-1]))/(x[i+1] - x[i-1]) - sig * u[i-1])/p;
  }
  if (ypn>0.99E30) {
    qn = 0;
    un = 0;
  } else {
    qn = 0.5;
    un = (3.0 / (x[n-1] - x[n-2])) * (ypn - (y[n-1] - y[n-2])/(x[n-1] - x[n-2]));
  }
  y2[n-1] = (un - qn * u[n-2]) / (qn * y2[n-2] + 1.0);
  for (k=n-2;k>=0;k--)
    y2[k] = y2[k] * y2[k+1] + u[k];

  delete[] u;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::zeta(double zz, double zl)
{
  return ((zz-zl)*(re+zl)/(re+zz));
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::densm(double alt, double d0, double xm, double *tz, int mn3,
                     double *zn3, double *tn3, double *tgn3, int mn2, double *zn2,
                     double *tn2, double *tgn2)
{
/*      Calculate Temperature and Density Profiles for lower atmos.  */
  double xs[10] = {0,0,0,0,0,0,0,0,0,0};
  double ys[10] = {0,0,0,0,0,0,0,0,0,0};
  double y2out[10] = {0,0,0,0,0,0,0,0,0,0};
  double rgas = 831.4;
  double z=0, z1=0, z2=0, t1=0, t2=0, zg=0, zgdif=0;
  double yd1=0, yd2=0;
  double x=0, y=0, yi=0;
  double expl=0, gamm=0, glb=0;
  double densm_tmp=0;
  int mn=0;
  int k=0;
  densm_tmp=d0;
  if (alt>zn2[0]) {
    if (xm==0.0)
      return *tz;
    else
      return d0;
  }

  /* STRATOSPHERE/MESOSPHERE TEMPERATURE */
  if (alt>zn2[mn2-1])
    z=alt;
  else
    z=zn2[mn2-1];
  mn=mn2;
  z1=zn2[0];
  z2=zn2[mn-1];
  t1=tn2[0];
  t2=tn2[mn-1];
  zg = zeta(z, z1);
  zgdif = zeta(z2, z1);

  /* set up spline nodes */
  for (k=0;k<mn;k++) {
    xs[k]=zeta(zn2[k],z1)/zgdif;
    ys[k]=1.0 / tn2[k];
  }
  yd1=-tgn2[0] / (t1*t1) * zgdif;
  yd2=-tgn2[1] / (t2*t2) * zgdif * (pow(((re+z2)/(re+z1)),2.0));

  /* calculate spline coefficients */
  spline (xs, ys, mn, yd1, yd2, y2out);
  x = zg/zgdif;
  splint (xs, ys, y2out, mn, x, &y);

  /* temperature at altitude */
  *tz = 1.0 / y;
  if (xm!=0.0) {
    /* calaculate stratosphere / mesospehere density */
    glb = gsurf / (pow((1.0 + z1/re),2.0));
    gamm = xm * glb * zgdif / rgas;

    /* Integrate temperature profile */
    splini(xs, ys, y2out, mn, x, &yi);
    expl=gamm*yi;
    if (expl>50.0)
      expl=50.0;

    /* Density at altitude */
    densm_tmp = densm_tmp * (t1 / *tz) * exp(-expl);
  }

  if (alt>zn3[0]) {
    if (xm==0.0)
      return *tz;
    else
      return densm_tmp;
  }

  /* troposhere / stratosphere temperature */
  z = alt;
  mn = mn3;
  z1=zn3[0];
  z2=zn3[mn-1];
  t1=tn3[0];
  t2=tn3[mn-1];
  zg=zeta(z,z1);
  zgdif=zeta(z2,z1);

  /* set up spline nodes */
  for (k=0;k<mn;k++) {
    xs[k] = zeta(zn3[k],z1) / zgdif;
    ys[k] = 1.0 / tn3[k];
  }
  yd1=-tgn3[0] / (t1*t1) * zgdif;
  yd2=-tgn3[1] / (t2*t2) * zgdif * (pow(((re+z2)/(re+z1)),2.0));

  /* calculate spline coefficients */
  spline (xs, ys, mn, yd1, yd2, y2out);
  x = zg/zgdif;
  splint (xs, ys, y2out, mn, x, &y);

  /* temperature at altitude */
  *tz = 1.0 / y;
  if (xm!=0.0) {
    /* calaculate tropospheric / stratosphere density */
    glb = gsurf / (pow((1.0 + z1/re),2.0));
    gamm = xm * glb * zgdif / rgas;

    /* Integrate temperature profile */
    splini(xs, ys, y2out, mn, x, &yi);
    expl=gamm*yi;
    if (expl>50.0)
      expl=50.0;

    /* Density at altitude */
    densm_tmp = densm_tmp * (t1 / *tz) * exp(-expl);
  }
  if (xm==0.0)
    return *tz;
  else
    return densm_tmp;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::densu(double alt, double dlb, double tinf, double tlb, double xm,
                     double alpha, double *tz, double zlb, double s2, int mn1,
                     double *zn1, double *tn1, double *tgn1)
{
/*      Calculate Temperature and Density Profiles for MSIS models
 *      New lower thermo polynomial
 */
  double yd2=0.0, yd1=0.0, x=0.0, y=0.0;
  double rgas=831.4;
  double densu_temp=1.0;
  double za=0.0, z=0.0, zg2=0.0, tt=0.0, ta=0.0;
  double dta=0.0, z1=0.0, z2=0.0, t1=0.0, t2=0.0, zg=0.0, zgdif=0.0;
  int mn=0;
  int k=0;
  double glb=0.0;
  double expl=0.0;
  double yi=0.0;
  double densa=0.0;
  double gamma=0.0, gamm=0.0;
  double xs[5]={0.0,0.0,0.0,0.0,0.0}, ys[5]={0.0,0.0,0.0,0.0,0.0}, y2out[5]={0.0,0.0,0.0,0.0,0.0};
  /* joining altitudes of Bates and spline */
  za=zn1[0];
  if (alt>za)
    z=alt;
  else
    z=za;

  /* geopotential altitude difference from ZLB */
  zg2 = zeta(z, zlb);

  /* Bates temperature */
  tt = tinf - (tinf - tlb) * exp(-s2*zg2);
  ta = tt;
  *tz = tt;
  densu_temp = *tz;

  if (alt<za) {
    /* calculate temperature below ZA
     * temperature gradient at ZA from Bates profile */
    dta = (tinf - ta) * s2 * pow(((re+zlb)/(re+za)),2.0);
    tgn1[0]=dta;
    tn1[0]=ta;
    if (alt>zn1[mn1-1])
      z=alt;
    else
      z=zn1[mn1-1];
    mn=mn1;
    z1=zn1[0];
    z2=zn1[mn-1];
    t1=tn1[0];
    t2=tn1[mn-1];
    /* geopotental difference from z1 */
    zg = zeta (z, z1);
    zgdif = zeta(z2, z1);
    /* set up spline nodes */
    for (k=0;k<mn;k++) {
      xs[k] = zeta(zn1[k], z1) / zgdif;
      ys[k] = 1.0 / tn1[k];
    }
    /* end node derivatives */
    yd1 = -tgn1[0] / (t1*t1) * zgdif;
    yd2 = -tgn1[1] / (t2*t2) * zgdif * pow(((re+z2)/(re+z1)),2.0);
    /* calculate spline coefficients */
    spline (xs, ys, mn, yd1, yd2, y2out);
    x = zg / zgdif;
    splint (xs, ys, y2out, mn, x, &y);
    /* temperature at altitude */
    *tz = 1.0 / y;
    densu_temp = *tz;
  }
  if (xm==0)
    return densu_temp;

  /* calculate density above za */
  glb = gsurf / pow((1.0 + zlb/re),2.0);
  gamma = xm * glb / (s2 * rgas * tinf);
  expl = exp(-s2 * gamma * zg2);
  if (expl>50.0)
      expl=50.0;
  if (tt<=0)
    expl=50.0;

  /* density at altitude */
  densa = dlb * pow((tlb/tt),((1.0+alpha+gamma))) * expl;
  densu_temp=densa;
  if (alt>=za)
    return densu_temp;

  /* calculate density below za */
  glb = gsurf / pow((1.0 + z1/re),2.0);
  gamm = xm * glb * zgdif / rgas;

  /* integrate spline temperatures */
  splini (xs, ys, y2out, mn, x, &yi);
  expl = gamm * yi;
  if (expl>50.0)
    expl=50.0;
  if (*tz<=0)
    expl=50.0;

  /* density at altitude */
  densu_temp = densu_temp * pow ((t1 / *tz),(1.0 + alpha)) * exp(-expl);
  return densu_temp;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

/*    3hr Magnetic activity functions */
/*    Eq. A24d */
double MSIS::g0(double a, double *p)
{
  return (a - 4.0 + (p[25] - 1.0) * (a - 4.0 + (exp(-sqrt(p[24]*p[24]) *
                (a - 4.0)) - 1.0) / sqrt(p[24]*p[24])));
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

/*    Eq. A24c */
double MSIS::sumex(double ex)
{
  return (1.0 + (1.0 - pow(ex,19.0)) / (1.0 - ex) * pow(ex,0.5));
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

/*    Eq. A24a */
double MSIS::sg0(double ex, double *p, double *ap)
{
  return (g0(ap[1],p) + (g0(ap[2],p)*ex + g0(ap[3],p)*ex*ex +
                g0(ap[4],p)*pow(ex,3.0)  + (g0(ap[5],p)*pow(ex,4.0) +
                g0(ap[6],p)*pow(ex,12.0))*(1.0-pow(ex,8.0))/(1.0-ex)))/sumex(ex);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::globe7(double *p, struct nrlmsise_input *input,
                      struct nrlmsise_flags *flags)
{
/*       CALCULATE G(L) FUNCTION
 *       Upper Thermosphere Parameters */
  double t[15];
  int i,j;
  double apd;
  double tloc;
  double c, s, c2, c4, s2;
  double sr = 7.2722E-5;
  double dgtr = 1.74533E-2;
  double dr = 1.72142E-2;
  double hr = 0.2618;
  double cd32, cd18, cd14, cd39;
  double df;
  double f1, f2;
  double tinf;
  struct ap_array *ap;

  tloc=input->lst;
  for (j=0;j<14;j++)
    t[j]=0;

  /* calculate legendre polynomials */
  c = sin(input->g_lat * dgtr);
  s = cos(input->g_lat * dgtr);
  c2 = c*c;
  c4 = c2*c2;
  s2 = s*s;

  plg[0][1] = c;
  plg[0][2] = 0.5*(3.0*c2 -1.0);
  plg[0][3] = 0.5*(5.0*c*c2-3.0*c);
  plg[0][4] = (35.0*c4 - 30.0*c2 + 3.0)/8.0;
  plg[0][5] = (63.0*c2*c2*c - 70.0*c2*c + 15.0*c)/8.0;
  plg[0][6] = (11.0*c*plg[0][5] - 5.0*plg[0][4])/6.0;
/*      plg[0][7] = (13.0*c*plg[0][6] - 6.0*plg[0][5])/7.0; */
  plg[1][1] = s;
  plg[1][2] = 3.0*c*s;
  plg[1][3] = 1.5*(5.0*c2-1.0)*s;
  plg[1][4] = 2.5*(7.0*c2*c-3.0*c)*s;
  plg[1][5] = 1.875*(21.0*c4 - 14.0*c2 +1.0)*s;
  plg[1][6] = (11.0*c*plg[1][5]-6.0*plg[1][4])/5.0;
/*      plg[1][7] = (13.0*c*plg[1][6]-7.0*plg[1][5])/6.0; */
/*      plg[1][8] = (15.0*c*plg[1][7]-8.0*plg[1][6])/7.0; */
  plg[2][2] = 3.0*s2;
  plg[2][3] = 15.0*s2*c;
  plg[2][4] = 7.5*(7.0*c2 -1.0)*s2;
  plg[2][5] = 3.0*c*plg[2][4]-2.0*plg[2][3];
  plg[2][6] =(11.0*c*plg[2][5]-7.0*plg[2][4])/4.0;
  plg[2][7] =(13.0*c*plg[2][6]-8.0*plg[2][5])/5.0;
  plg[3][3] = 15.0*s2*s;
  plg[3][4] = 105.0*s2*s*c;
  plg[3][5] =(9.0*c*plg[3][4]-7.*plg[3][3])/2.0;
  plg[3][6] =(11.0*c*plg[3][5]-8.*plg[3][4])/3.0;

  if (!(((flags->sw[7]==0)&&(flags->sw[8]==0))&&(flags->sw[14]==0))) {
    stloc = sin(hr*tloc);
    ctloc = cos(hr*tloc);
    s2tloc = sin(2.0*hr*tloc);
    c2tloc = cos(2.0*hr*tloc);
    s3tloc = sin(3.0*hr*tloc);
    c3tloc = cos(3.0*hr*tloc);
  }

  cd32 = cos(dr*(input->doy-p[31]));
  cd18 = cos(2.0*dr*(input->doy-p[17]));
  cd14 = cos(dr*(input->doy-p[13]));
  cd39 = cos(2.0*dr*(input->doy-p[38]));

  /* F10.7 EFFECT */
  df = input->f107 - input->f107A;
  dfa = input->f107A - 150.0;
  t[0] =  p[19]*df*(1.0+p[59]*dfa) + p[20]*df*df + p[21]*dfa + p[29]*pow(dfa,2.0);
  f1 = 1.0 + (p[47]*dfa +p[19]*df+p[20]*df*df)*flags->swc[1];
  f2 = 1.0 + (p[49]*dfa+p[19]*df+p[20]*df*df)*flags->swc[1];

  /*  TIME INDEPENDENT */
  t[1] = (p[1]*plg[0][2]+ p[2]*plg[0][4]+p[22]*plg[0][6]) +
        (p[14]*plg[0][2])*dfa*flags->swc[1] +p[26]*plg[0][1];

  /*  SYMMETRICAL ANNUAL */
  t[2] = p[18]*cd32;

  /*  SYMMETRICAL SEMIANNUAL */
  t[3] = (p[15]+p[16]*plg[0][2])*cd18;

  /*  ASYMMETRICAL ANNUAL */
  t[4] =  f1*(p[9]*plg[0][1]+p[10]*plg[0][3])*cd14;

  /*  ASYMMETRICAL SEMIANNUAL */
  t[5] =    p[37]*plg[0][1]*cd39;

        /* DIURNAL */
  if (flags->sw[7]) {
    double t71, t72;
    t71 = (p[11]*plg[1][2])*cd14*flags->swc[5];
    t72 = (p[12]*plg[1][2])*cd14*flags->swc[5];
    t[6] = f2*((p[3]*plg[1][1] + p[4]*plg[1][3] + p[27]*plg[1][5] + t71) * \
         ctloc + (p[6]*plg[1][1] + p[7]*plg[1][3] + p[28]*plg[1][5] \
            + t72)*stloc);
}

  /* SEMIDIURNAL */
  if (flags->sw[8]) {
    double t81, t82;
    t81 = (p[23]*plg[2][3]+p[35]*plg[2][5])*cd14*flags->swc[5];
    t82 = (p[33]*plg[2][3]+p[36]*plg[2][5])*cd14*flags->swc[5];
    t[7] = f2*((p[5]*plg[2][2]+ p[41]*plg[2][4] + t81)*c2tloc +(p[8]*plg[2][2] + p[42]*plg[2][4] + t82)*s2tloc);
  }

  /* TERDIURNAL */
  if (flags->sw[14]) {
    t[13] = f2 * ((p[39]*plg[3][3]+(p[93]*plg[3][4]+p[46]*plg[3][6])*cd14*flags->swc[5])* s3tloc +(p[40]*plg[3][3]+(p[94]*plg[3][4]+p[48]*plg[3][6])*cd14*flags->swc[5])* c3tloc);
}

  /* magnetic activity based on daily ap */
  if (flags->sw[9]==-1) {
    ap = input->ap_a;
    if (p[51]!=0) {
      double exp1;
      exp1 = exp(-10800.0*sqrt(p[51]*p[51])/(1.0+p[138]*(45.0-sqrt(input->g_lat*input->g_lat))));
      if (exp1>0.99999)
        exp1=0.99999;
      if (p[24]<1.0E-4)
        p[24]=1.0E-4;
      apt[0]=sg0(exp1,p,ap->a);
      /* apt[1]=sg2(exp1,p,ap->a);
         apt[2]=sg0(exp2,p,ap->a);
         apt[3]=sg2(exp2,p,ap->a);
      */
      if (flags->sw[9]) {
        t[8] = apt[0]*(p[50]+p[96]*plg[0][2]+p[54]*plg[0][4]+ \
     (p[125]*plg[0][1]+p[126]*plg[0][3]+p[127]*plg[0][5])*cd14*flags->swc[5]+ \
     (p[128]*plg[1][1]+p[129]*plg[1][3]+p[130]*plg[1][5])*flags->swc[7]* \
                 cos(hr*(tloc-p[131])));
      }
    }
  } else {
    double p44, p45;
    apd=input->ap-4.0;
    p44=p[43];
    p45=p[44];
    if (p44<0)
      p44 = 1.0E-5;
    apdf = apd + (p45-1.0)*(apd + (exp(-p44 * apd) - 1.0)/p44);
    if (flags->sw[9]) {
      t[8]=apdf*(p[32]+p[45]*plg[0][2]+p[34]*plg[0][4]+ \
     (p[100]*plg[0][1]+p[101]*plg[0][3]+p[102]*plg[0][5])*cd14*flags->swc[5]+
     (p[121]*plg[1][1]+p[122]*plg[1][3]+p[123]*plg[1][5])*flags->swc[7]*
            cos(hr*(tloc-p[124])));
    }
  }

  if ((flags->sw[10])&&(input->g_long>-1000.0)) {

    /* longitudinal */
    if (flags->sw[11]) {
      t[10] = (1.0 + p[80]*dfa*flags->swc[1])* \
     ((p[64]*plg[1][2]+p[65]*plg[1][4]+p[66]*plg[1][6]\
      +p[103]*plg[1][1]+p[104]*plg[1][3]+p[105]*plg[1][5]\
      +flags->swc[5]*(p[109]*plg[1][1]+p[110]*plg[1][3]+p[111]*plg[1][5])*cd14)* \
          cos(dgtr*input->g_long) \
      +(p[90]*plg[1][2]+p[91]*plg[1][4]+p[92]*plg[1][6]\
      +p[106]*plg[1][1]+p[107]*plg[1][3]+p[108]*plg[1][5]\
      +flags->swc[5]*(p[112]*plg[1][1]+p[113]*plg[1][3]+p[114]*plg[1][5])*cd14)* \
      sin(dgtr*input->g_long));
    }

    /* ut and mixed ut, longitude */
    if (flags->sw[12]){
      t[11]=(1.0+p[95]*plg[0][1])*(1.0+p[81]*dfa*flags->swc[1])*\
        (1.0+p[119]*plg[0][1]*flags->swc[5]*cd14)*\
        ((p[68]*plg[0][1]+p[69]*plg[0][3]+p[70]*plg[0][5])*\
        cos(sr*(input->sec-p[71])));
      t[11]+=flags->swc[11]*\
        (p[76]*plg[2][3]+p[77]*plg[2][5]+p[78]*plg[2][7])*\
        cos(sr*(input->sec-p[79])+2.0*dgtr*input->g_long)*(1.0+p[137]*dfa*flags->swc[1]);
    }

    /* ut, longitude magnetic activity */
    if (flags->sw[13]) {
      if (flags->sw[9]==-1) {
        if (p[51]) {
          t[12]=apt[0]*flags->swc[11]*(1.+p[132]*plg[0][1])*\
            ((p[52]*plg[1][2]+p[98]*plg[1][4]+p[67]*plg[1][6])*\
             cos(dgtr*(input->g_long-p[97])))\
            +apt[0]*flags->swc[11]*flags->swc[5]*\
            (p[133]*plg[1][1]+p[134]*plg[1][3]+p[135]*plg[1][5])*\
            cd14*cos(dgtr*(input->g_long-p[136])) \
            +apt[0]*flags->swc[12]* \
            (p[55]*plg[0][1]+p[56]*plg[0][3]+p[57]*plg[0][5])*\
            cos(sr*(input->sec-p[58]));
        }
      } else {
        t[12] = apdf*flags->swc[11]*(1.0+p[120]*plg[0][1])*\
          ((p[60]*plg[1][2]+p[61]*plg[1][4]+p[62]*plg[1][6])*\
          cos(dgtr*(input->g_long-p[63])))\
          +apdf*flags->swc[11]*flags->swc[5]* \
          (p[115]*plg[1][1]+p[116]*plg[1][3]+p[117]*plg[1][5])* \
          cd14*cos(dgtr*(input->g_long-p[118])) \
          + apdf*flags->swc[12]* \
          (p[83]*plg[0][1]+p[84]*plg[0][3]+p[85]*plg[0][5])* \
          cos(sr*(input->sec-p[75]));
      }
    }
  }

  /* parms not used: 82, 89, 99, 139-149 */
  tinf = p[30];
  for (i=0;i<14;i++)
    tinf = tinf + fabs(flags->sw[i+1])*t[i];
  return tinf;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double MSIS::glob7s(double *p, struct nrlmsise_input *input,
                      struct nrlmsise_flags *flags)
{
/*    VERSION OF GLOBE FOR LOWER ATMOSPHERE 10/26/99
 */
  double pset=2.0;
  double t[14] = {0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,};
  double tt=0.0;
  double cd32=0.0, cd18=0.0, cd14=0.0, cd39=0.0;
  int i=0,j=0;
  double dr=1.72142E-2;
  double dgtr=1.74533E-2;
  /* confirm parameter set */
  if (p[99]==0)
    p[99]=pset;
  if (p[99]!=pset) {
    cerr << "Wrong parameter set for glob7s" << endl;
    return -1;
  }
  for (j=0;j<14;j++)
    t[j]=0.0;
  cd32 = cos(dr*(input->doy-p[31]));
  cd18 = cos(2.0*dr*(input->doy-p[17]));
  cd14 = cos(dr*(input->doy-p[13]));
  cd39 = cos(2.0*dr*(input->doy-p[38]));

  /* F10.7 */
  t[0] = p[21]*dfa;

  /* time independent */
  t[1]=p[1]*plg[0][2] + p[2]*plg[0][4] + p[22]*plg[0][6] + p[26]*plg[0][1] + p[14]*plg[0][3] + p[59]*plg[0][5];

        /* SYMMETRICAL ANNUAL */
  t[2]=(p[18]+p[47]*plg[0][2]+p[29]*plg[0][4])*cd32;

        /* SYMMETRICAL SEMIANNUAL */
  t[3]=(p[15]+p[16]*plg[0][2]+p[30]*plg[0][4])*cd18;

        /* ASYMMETRICAL ANNUAL */
  t[4]=(p[9]*plg[0][1]+p[10]*plg[0][3]+p[20]*plg[0][5])*cd14;

  /* ASYMMETRICAL SEMIANNUAL */
  t[5]=(p[37]*plg[0][1])*cd39;

        /* DIURNAL */
  if (flags->sw[7]) {
    double t71, t72;
    t71 = p[11]*plg[1][2]*cd14*flags->swc[5];
    t72 = p[12]*plg[1][2]*cd14*flags->swc[5];
    t[6] = ((p[3]*plg[1][1] + p[4]*plg[1][3] + t71) * ctloc + (p[6]*plg[1][1] + p[7]*plg[1][3] + t72) * stloc) ;
  }

  /* SEMIDIURNAL */
  if (flags->sw[8]) {
    double t81, t82;
    t81 = (p[23]*plg[2][3]+p[35]*plg[2][5])*cd14*flags->swc[5];
    t82 = (p[33]*plg[2][3]+p[36]*plg[2][5])*cd14*flags->swc[5];
    t[7] = ((p[5]*plg[2][2] + p[41]*plg[2][4] + t81) * c2tloc + (p[8]*plg[2][2] + p[42]*plg[2][4] + t82) * s2tloc);
  }

  /* TERDIURNAL */
  if (flags->sw[14]) {
    t[13] = p[39] * plg[3][3] * s3tloc + p[40] * plg[3][3] * c3tloc;
  }

  /* MAGNETIC ACTIVITY */
  if (flags->sw[9]) {
    if (flags->sw[9]==1)
      t[8] = apdf * (p[32] + p[45] * plg[0][2] * flags->swc[2]);
    if (flags->sw[9]==-1)
      t[8]=(p[50]*apt[0] + p[96]*plg[0][2] * apt[0]*flags->swc[2]);
  }

  /* LONGITUDINAL */
  if (!((flags->sw[10]==0) || (flags->sw[11]==0) || (input->g_long<=-1000.0))) {
    t[10] = (1.0 + plg[0][1]*(p[80]*flags->swc[5]*cos(dr*(input->doy-p[81]))\
            +p[85]*flags->swc[6]*cos(2.0*dr*(input->doy-p[86])))\
      +p[83]*flags->swc[3]*cos(dr*(input->doy-p[84]))\
      +p[87]*flags->swc[4]*cos(2.0*dr*(input->doy-p[88])))\
      *((p[64]*plg[1][2]+p[65]*plg[1][4]+p[66]*plg[1][6]\
      +p[74]*plg[1][1]+p[75]*plg[1][3]+p[76]*plg[1][5]\
      )*cos(dgtr*input->g_long)\
      +(p[90]*plg[1][2]+p[91]*plg[1][4]+p[92]*plg[1][6]\
      +p[77]*plg[1][1]+p[78]*plg[1][3]+p[79]*plg[1][5]\
      )*sin(dgtr*input->g_long));
  }
  tt=0;
  for (i=0;i<14;i++)
    tt+=fabs(flags->sw[i+1])*t[i];
  return tt;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::gtd7(struct nrlmsise_input *input, struct nrlmsise_flags *flags,
                  struct nrlmsise_output *output)
{
  double xlat=0.0;
  double xmm=0.0;
  int mn3 = 5;
  double zn3[5]={32.5,20.0,15.0,10.0,0.0};
  int mn2 = 4;
  double zn2[4]={72.5,55.0,45.0,32.5};
  double altt=0.0;
  double zmix=62.5;
  double tmp=0.0;
  double dm28m=0.0;
  double tz=0.0;
  double dmc=0.0;
  double dmr=0.0;
  double dz28=0.0;
  struct nrlmsise_output soutput;
  int i;

  for (int i=0; i<9; i++) soutput.d[i] = 0.0;
  for (int i=0; i<2; i++) soutput.t[i] = 0.0;

  tselec(flags);

  /* Latitude variation of gravity (none for sw[2]=0) */
  xlat=input->g_lat;
  if (flags->sw[2]==0)
    xlat=45.0;
  glatf(xlat, &gsurf, &re);

  xmm = pdm[2][4];

  /* THERMOSPHERE / MESOSPHERE (above zn2[0]) */
  if (input->alt>zn2[0])
    altt=input->alt;
  else
    altt=zn2[0];

  tmp=input->alt;
  input->alt=altt;
  gts7(input, flags, &soutput);
  altt=input->alt;
  input->alt=tmp;
  if (flags->sw[0])   /* metric adjustment */
    dm28m=dm28*1.0E6;
  else
    dm28m=dm28;
  output->t[0]=soutput.t[0];
  output->t[1]=soutput.t[1];
  if (input->alt>=zn2[0]) {
    for (i=0;i<9;i++)
      output->d[i]=soutput.d[i];
    return;
  }

/*       LOWER MESOSPHERE/UPPER STRATOSPHERE (between zn3[0] and zn2[0])
 *         Temperature at nodes and gradients at end nodes
 *         Inverse temperature a linear function of spherical harmonics
 */
  meso_tgn2[0]=meso_tgn1[1];
  meso_tn2[0]=meso_tn1[4];
        meso_tn2[1]=pma[0][0]*pavgm[0]/(1.0-flags->sw[20]*glob7s(pma[0], input, flags));
        meso_tn2[2]=pma[1][0]*pavgm[1]/(1.0-flags->sw[20]*glob7s(pma[1], input, flags));
        meso_tn2[3]=pma[2][0]*pavgm[2]/(1.0-flags->sw[20]*flags->sw[22]*glob7s(pma[2], input, flags));
  meso_tgn2[1]=pavgm[8]*pma[9][0]*(1.0+flags->sw[20]*flags->sw[22]*glob7s(pma[9], input, flags))*meso_tn2[3]*meso_tn2[3]/(pow((pma[2][0]*pavgm[2]),2.0));
  meso_tn3[0]=meso_tn2[3];

  if (input->alt<zn3[0]) {
/*       LOWER STRATOSPHERE AND TROPOSPHERE (below zn3[0])
 *         Temperature at nodes and gradients at end nodes
 *         Inverse temperature a linear function of spherical harmonics
 */
    meso_tgn3[0]=meso_tgn2[1];
    meso_tn3[1]=pma[3][0]*pavgm[3]/(1.0-flags->sw[22]*glob7s(pma[3], input, flags));
    meso_tn3[2]=pma[4][0]*pavgm[4]/(1.0-flags->sw[22]*glob7s(pma[4], input, flags));
    meso_tn3[3]=pma[5][0]*pavgm[5]/(1.0-flags->sw[22]*glob7s(pma[5], input, flags));
    meso_tn3[4]=pma[6][0]*pavgm[6]/(1.0-flags->sw[22]*glob7s(pma[6], input, flags));
    meso_tgn3[1]=pma[7][0]*pavgm[7]*(1.0+flags->sw[22]*glob7s(pma[7], input, flags)) *meso_tn3[4]*meso_tn3[4]/(pow((pma[6][0]*pavgm[6]),2.0));
  }

        /* LINEAR TRANSITION TO FULL MIXING BELOW zn2[0] */

  dmc=0;
  if (input->alt>zmix)
    dmc = 1.0 - (zn2[0]-input->alt)/(zn2[0] - zmix);
  dz28=soutput.d[2];

  /**** N2 density ****/
  dmr=soutput.d[2] / dm28m - 1.0;
  output->d[2]=densm(input->alt,dm28m,xmm, &tz, mn3, zn3, meso_tn3, meso_tgn3, mn2, zn2, meso_tn2, meso_tgn2);
  output->d[2]=output->d[2] * (1.0 + dmr*dmc);

  /**** HE density ****/
  dmr = soutput.d[0] / (dz28 * pdm[0][1]) - 1.0;
  output->d[0] = output->d[2] * pdm[0][1] * (1.0 + dmr*dmc);

  /**** O density ****/
  output->d[1] = 0;
  output->d[8] = 0;

  /**** O2 density ****/
  dmr = soutput.d[3] / (dz28 * pdm[3][1]) - 1.0;
  output->d[3] = output->d[2] * pdm[3][1] * (1.0 + dmr*dmc);

  /**** AR density ***/
  dmr = soutput.d[4] / (dz28 * pdm[4][1]) - 1.0;
  output->d[4] = output->d[2] * pdm[4][1] * (1.0 + dmr*dmc);

  /**** Hydrogen density ****/
  output->d[6] = 0;

  /**** Atomic nitrogen density ****/
  output->d[7] = 0;

  /**** Total mass density */
  output->d[5] = 1.66E-24 * (4.0 * output->d[0] + 16.0 * output->d[1] +
                     28.0 * output->d[2] + 32.0 * output->d[3] + 40.0 * output->d[4]
                     + output->d[6] + 14.0 * output->d[7]);

  if (flags->sw[0])
    output->d[5]=output->d[5]/1000;

  /**** temperature at altitude ****/
  dd = densm(input->alt, 1.0, 0, &tz, mn3, zn3, meso_tn3, meso_tgn3,
                   mn2, zn2, meso_tn2, meso_tgn2);
  output->t[1]=tz;

}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::gtd7d(struct nrlmsise_input *input, struct nrlmsise_flags *flags,
                   struct nrlmsise_output *output)
{
  gtd7(input, flags, output);
  output->d[5] = 1.66E-24 * (4.0 * output->d[0] + 16.0 * output->d[1] +
                   28.0 * output->d[2] + 32.0 * output->d[3] + 40.0 * output->d[4]
                   + output->d[6] + 14.0 * output->d[7] + 16.0 * output->d[8]);
  if (flags->sw[0])
    output->d[5]=output->d[5]/1000;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::ghp7(struct nrlmsise_input *input, struct nrlmsise_flags *flags,
                  struct nrlmsise_output *output, double press)
{
  double bm = 1.3806E-19;
  double rgas = 831.4;
  double test = 0.00043;
  double ltest = 12;
  double pl, p;
  double zi = 0.0;
  double z;
  double cl, cl2;
  double ca, cd;
  double xn, xm, diff;
  double g, sh;
  int l;
  pl = log10(press);
  if (pl >= -5.0) {
    if (pl>2.5)
      zi = 18.06 * (3.00 - pl);
    else if ((pl>0.075) && (pl<=2.5))
      zi = 14.98 * (3.08 - pl);
    else if ((pl>-1) && (pl<=0.075))
      zi = 17.80 * (2.72 - pl);
    else if ((pl>-2) && (pl<=-1))
      zi = 14.28 * (3.64 - pl);
    else if ((pl>-4) && (pl<=-2))
      zi = 12.72 * (4.32 -pl);
    else if (pl<=-4)
      zi = 25.3 * (0.11 - pl);
    cl = input->g_lat/90.0;
    cl2 = cl*cl;
    if (input->doy<182)
      cd = (1.0 - (double) input->doy) / 91.25;
    else
      cd = ((double) input->doy) / 91.25 - 3.0;
    ca = 0;
    if ((pl > -1.11) && (pl<=-0.23))
      ca = 1.0;
    if (pl > -0.23)
      ca = (2.79 - pl) / (2.79 + 0.23);
    if ((pl <= -1.11) && (pl>-3))
      ca = (-2.93 - pl)/(-2.93 + 1.11);
    z = zi - 4.87 * cl * cd * ca - 1.64 * cl2 * ca + 0.31 * ca * cl;
  } else
    z = 22.0 * pow((pl + 4.0),2.0) + 110.0;

  /* iteration  loop */
  l = 0;
  do {
    l++;
    input->alt = z;
    gtd7(input, flags, output);
    z = input->alt;
    xn = output->d[0] + output->d[1] + output->d[2] + output->d[3] + output->d[4] + output->d[6] + output->d[7];
    p = bm * xn * output->t[1];
    if (flags->sw[0])
      p = p*1.0E-6;
    diff = pl - log10(p);
    if (sqrt(diff*diff)<test)
      return;
    if (l==ltest) {
      cerr << "ERROR: ghp7 not converging for press " << press << ", diff " << diff << endl;
      return;
    }
    xm = output->d[5] / xn / 1.66E-24;
    if (flags->sw[0])
      xm = xm * 1.0E3;
    g = gsurf / (pow((1.0 + z/re),2.0));
    sh = rgas * output->t[1] / (xm * g);

    /* new altitude estimate using scale height */
    if (l <  6)
      z = z - sh * diff * 2.302;
    else
      z = z - sh * diff;
  } while (1==1);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void MSIS::gts7(struct nrlmsise_input *input, struct nrlmsise_flags *flags,
                  struct nrlmsise_output *output)
{
/*     Thermospheric portion of NRLMSISE-00
 *     See GTD7 for more extensive comments
 *     alt > 72.5 km!
 */
  double za=0.0;
  int i, j;
  double z=0.0;
  double zn1[5] = {120.0, 110.0, 100.0, 90.0, 72.5};
  double tinf=0.0;
  int mn1 = 5;
  double g0=0.0;
  double tlb=0.0;
  double s=0.0;
  double db01=0.0, db04=0.0, db14=0.0, db16=0.0, db28=0.0, db32=0.0, db40=0.0;
  double zh28=0.0, zh04=0.0, zh16=0.0, zh32=0.0, zh40=0.0, zh01=0.0, zh14=0.0;
  double zhm28=0.0, zhm04=0.0, zhm16=0.0, zhm32=0.0, zhm40=0.0, zhm01=0.0, zhm14=0.0;
  double xmd=0.0;
  double b28=0.0, b04=0.0, b16=0.0, b32=0.0, b40=0.0, b01=0.0, b14=0.0;
  double tz=0.0;
  double g28=0.0, g4=0.0, g16=0.0, g32=0.0, g40=0.0, g1=0.0, g14=0.0;
  double zhf=0.0, xmm=0.0;
  double zc04=0.0, zc16=0.0, zc32=0.0, zc40=0.0, zc01=0.0, zc14=0.0;
  double hc04=0.0, hc16=0.0, hc32=0.0, hc40=0.0, hc01=0.0, hc14=0.0;
  double hcc16=0.0, hcc32=0.0, hcc01=0.0, hcc14=0.0;
  double zcc16=0.0, zcc32=0.0, zcc01=0.0, zcc14=0.0;
  double rc16=0.0, rc32=0.0, rc01=0.0, rc14=0.0;
  double rl=0.0;
  double g16h=0.0, db16h=0.0, tho=0.0, zsht=0.0, zmho=0.0, zsho=0.0;
  double dgtr=1.74533E-2;
  double dr=1.72142E-2;
  double alpha[9]={-0.38, 0.0, 0.0, 0.0, 0.17, 0.0, -0.38, 0.0, 0.0};
  double altl[8]={200.0, 300.0, 160.0, 250.0, 240.0, 450.0, 320.0, 450.0};
  double dd=0.0;
  double hc216=0.0, hcc232=0.0;
  za = pdl[1][15];
  zn1[0] = za;
  for (j=0;j<9;j++)
    output->d[j]=0;

  /* TINF VARIATIONS NOT IMPORTANT BELOW ZA OR ZN1(1) */
  if (input->alt>zn1[0])
    tinf = ptm[0]*pt[0] * \
      (1.0+flags->sw[16]*globe7(pt,input,flags));
  else
    tinf = ptm[0]*pt[0];
  output->t[0]=tinf;

  /*  GRADIENT VARIATIONS NOT IMPORTANT BELOW ZN1(5) */
  if (input->alt>zn1[4])
    g0 = ptm[3]*ps[0] * \
      (1.0+flags->sw[19]*globe7(ps,input,flags));
  else
    g0 = ptm[3]*ps[0];
  tlb = ptm[1] * (1.0 + flags->sw[17]*globe7(pd[3],input,flags))*pd[3][0];
  s = g0 / (tinf - tlb);

/*      Lower thermosphere temp variations not significant for
 *       density above 300 km */
  if (input->alt<300.0) {
    meso_tn1[1]=ptm[6]*ptl[0][0]/(1.0-flags->sw[18]*glob7s(ptl[0], input, flags));
    meso_tn1[2]=ptm[2]*ptl[1][0]/(1.0-flags->sw[18]*glob7s(ptl[1], input, flags));
    meso_tn1[3]=ptm[7]*ptl[2][0]/(1.0-flags->sw[18]*glob7s(ptl[2], input, flags));
    meso_tn1[4]=ptm[4]*ptl[3][0]/(1.0-flags->sw[18]*flags->sw[20]*glob7s(ptl[3], input, flags));
    meso_tgn1[1]=ptm[8]*pma[8][0]*(1.0+flags->sw[18]*flags->sw[20]*glob7s(pma[8], input, flags))*meso_tn1[4]*meso_tn1[4]/(pow((ptm[4]*ptl[3][0]),2.0));
  } else {
    meso_tn1[1]=ptm[6]*ptl[0][0];
    meso_tn1[2]=ptm[2]*ptl[1][0];
    meso_tn1[3]=ptm[7]*ptl[2][0];
    meso_tn1[4]=ptm[4]*ptl[3][0];
    meso_tgn1[1]=ptm[8]*pma[8][0]*meso_tn1[4]*meso_tn1[4]/(pow((ptm[4]*ptl[3][0]),2.0));
  }

  /* N2 variation factor at Zlb */
  g28=flags->sw[21]*globe7(pd[2], input, flags);

  /* VARIATION OF TURBOPAUSE HEIGHT */
  zhf=pdl[1][24]*(1.0+flags->sw[5]*pdl[0][24]*sin(dgtr*input->g_lat)*cos(dr*(input->doy-pt[13])));
  output->t[0]=tinf;
  xmm = pdm[2][4];
  z = input->alt;


        /**** N2 DENSITY ****/

  /* Diffusive density at Zlb */
  db28 = pdm[2][0]*exp(g28)*pd[2][0];
  /* Diffusive density at Alt */
  output->d[2]=densu(z,db28,tinf,tlb,28.0,alpha[2],&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
  dd=output->d[2];
  /* Turbopause */
  zh28=pdm[2][2]*zhf;
  zhm28=pdm[2][3]*pdl[1][5];
  xmd=28.0-xmm;
  /* Mixed density at Zlb */
  b28=densu(zh28,db28,tinf,tlb,xmd,(alpha[2]-1.0),&tz,ptm[5],s,mn1, zn1,meso_tn1,meso_tgn1);
  if ((flags->sw[15])&&(z<=altl[2])) {
    /*  Mixed density at Alt */
    dm28=densu(z,b28,tinf,tlb,xmm,alpha[2],&tz,ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Net density at Alt */
    output->d[2]=dnet(output->d[2],dm28,zhm28,xmm,28.0);
  }


        /**** HE DENSITY ****/

  /*   Density variation factor at Zlb */
  g4 = flags->sw[21]*globe7(pd[0], input, flags);
  /*  Diffusive density at Zlb */
  db04 = pdm[0][0]*exp(g4)*pd[0][0];
        /*  Diffusive density at Alt */
  output->d[0]=densu(z,db04,tinf,tlb, 4.,alpha[0],&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
  dd=output->d[0];
  if ((flags->sw[15]) && (z<altl[0])) {
    /*  Turbopause */
    zh04=pdm[0][2];
    /*  Mixed density at Zlb */
    b04=densu(zh04,db04,tinf,tlb,4.-xmm,alpha[0]-1.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Mixed density at Alt */
    dm04=densu(z,b04,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    zhm04=zhm28;
    /*  Net density at Alt */
    output->d[0]=dnet(output->d[0],dm04,zhm04,xmm,4.);
    /*  Correction to specified mixing ratio at ground */
    rl=log(b28*pdm[0][1]/b04);
    zc04=pdm[0][4]*pdl[1][0];
    hc04=pdm[0][5]*pdl[1][1];
    /*  Net density corrected at Alt */
    output->d[0]=output->d[0]*ccor(z,rl,hc04,zc04);
  }


        /**** O DENSITY ****/

  /*  Density variation factor at Zlb */
  g16= flags->sw[21]*globe7(pd[1],input,flags);
  /*  Diffusive density at Zlb */
  db16 =  pdm[1][0]*exp(g16)*pd[1][0];
        /*   Diffusive density at Alt */
  output->d[1]=densu(z,db16,tinf,tlb, 16.,alpha[1],&output->t[1],ptm[5],s,mn1, zn1,meso_tn1,meso_tgn1);
  dd=output->d[1];
  if ((flags->sw[15]) && (z<=altl[1])) {
    /*   Turbopause */
    zh16=pdm[1][2];
    /*  Mixed density at Zlb */
    b16=densu(zh16,db16,tinf,tlb,16.0-xmm,(alpha[1]-1.0), &output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Mixed density at Alt */
    dm16=densu(z,b16,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    zhm16=zhm28;
    /*  Net density at Alt */
    output->d[1]=dnet(output->d[1],dm16,zhm16,xmm,16.);
    rl=pdm[1][1]*pdl[1][16]*(1.0+flags->sw[1]*pdl[0][23]*(input->f107A-150.0));
    hc16=pdm[1][5]*pdl[1][3];
    zc16=pdm[1][4]*pdl[1][2];
    hc216=pdm[1][5]*pdl[1][4];
    output->d[1]=output->d[1]*ccor2(z,rl,hc16,zc16,hc216);
    /*   Chemistry correction */
    hcc16=pdm[1][7]*pdl[1][13];
    zcc16=pdm[1][6]*pdl[1][12];
    rc16=pdm[1][3]*pdl[1][14];
    /*  Net density corrected at Alt */
    output->d[1]=output->d[1]*ccor(z,rc16,hcc16,zcc16);
  }


        /**** O2 DENSITY ****/

        /*   Density variation factor at Zlb */
  g32= flags->sw[21]*globe7(pd[4], input, flags);
        /*  Diffusive density at Zlb */
  db32 = pdm[3][0]*exp(g32)*pd[4][0];
        /*   Diffusive density at Alt */
  output->d[3]=densu(z,db32,tinf,tlb, 32.,alpha[3],&output->t[1],ptm[5],s,mn1, zn1,meso_tn1,meso_tgn1);
  dd=output->d[3];
  if (flags->sw[15]) {
    if (z<=altl[3]) {
      /*   Turbopause */
      zh32=pdm[3][2];
      /*  Mixed density at Zlb */
      b32=densu(zh32,db32,tinf,tlb,32.-xmm,alpha[3]-1., &output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
      /*  Mixed density at Alt */
      dm32=densu(z,b32,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
      zhm32=zhm28;
      /*  Net density at Alt */
      output->d[3]=dnet(output->d[3],dm32,zhm32,xmm,32.);
      /*   Correction to specified mixing ratio at ground */
      rl=log(b28*pdm[3][1]/b32);
      hc32=pdm[3][5]*pdl[1][7];
      zc32=pdm[3][4]*pdl[1][6];
      output->d[3]=output->d[3]*ccor(z,rl,hc32,zc32);
    }
    /*  Correction for general departure from diffusive equilibrium above Zlb */
    hcc32=pdm[3][7]*pdl[1][22];
    hcc232=pdm[3][7]*pdl[0][22];
    zcc32=pdm[3][6]*pdl[1][21];
    rc32=pdm[3][3]*pdl[1][23]*(1.+flags->sw[1]*pdl[0][23]*(input->f107A-150.));
    /*  Net density corrected at Alt */
    output->d[3]=output->d[3]*ccor2(z,rc32,hcc32,zcc32,hcc232);
  }


        /**** AR DENSITY ****/

        /*   Density variation factor at Zlb */
  g40= flags->sw[21]*globe7(pd[5],input,flags);
        /*  Diffusive density at Zlb */
  db40 = pdm[4][0]*exp(g40)*pd[5][0];
  /*   Diffusive density at Alt */
  output->d[4]=densu(z,db40,tinf,tlb, 40.,alpha[4],&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
  dd=output->d[4];
  if ((flags->sw[15]) && (z<=altl[4])) {
    /*   Turbopause */
    zh40=pdm[4][2];
    /*  Mixed density at Zlb */
    b40=densu(zh40,db40,tinf,tlb,40.-xmm,alpha[4]-1.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Mixed density at Alt */
    dm40=densu(z,b40,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    zhm40=zhm28;
    /*  Net density at Alt */
    output->d[4]=dnet(output->d[4],dm40,zhm40,xmm,40.);
    /*   Correction to specified mixing ratio at ground */
    rl=log(b28*pdm[4][1]/b40);
    hc40=pdm[4][5]*pdl[1][9];
    zc40=pdm[4][4]*pdl[1][8];
    /*  Net density corrected at Alt */
    output->d[4]=output->d[4]*ccor(z,rl,hc40,zc40);
    }


        /**** HYDROGEN DENSITY ****/

        /*   Density variation factor at Zlb */
  g1 = flags->sw[21]*globe7(pd[6], input, flags);
        /*  Diffusive density at Zlb */
  db01 = pdm[5][0]*exp(g1)*pd[6][0];
        /*   Diffusive density at Alt */
  output->d[6]=densu(z,db01,tinf,tlb,1.,alpha[6],&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
  dd=output->d[6];
  if ((flags->sw[15]) && (z<=altl[6])) {
    /*   Turbopause */
    zh01=pdm[5][2];
    /*  Mixed density at Zlb */
    b01=densu(zh01,db01,tinf,tlb,1.-xmm,alpha[6]-1., &output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Mixed density at Alt */
    dm01=densu(z,b01,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    zhm01=zhm28;
    /*  Net density at Alt */
    output->d[6]=dnet(output->d[6],dm01,zhm01,xmm,1.);
    /*   Correction to specified mixing ratio at ground */
    rl=log(b28*pdm[5][1]*sqrt(pdl[1][17]*pdl[1][17])/b01);
    hc01=pdm[5][5]*pdl[1][11];
    zc01=pdm[5][4]*pdl[1][10];
    output->d[6]=output->d[6]*ccor(z,rl,hc01,zc01);
    /*   Chemistry correction */
    hcc01=pdm[5][7]*pdl[1][19];
    zcc01=pdm[5][6]*pdl[1][18];
    rc01=pdm[5][3]*pdl[1][20];
    /*  Net density corrected at Alt */
    output->d[6]=output->d[6]*ccor(z,rc01,hcc01,zcc01);
}


        /**** ATOMIC NITROGEN DENSITY ****/

  /*   Density variation factor at Zlb */
  g14 = flags->sw[21]*globe7(pd[7],input,flags);
        /*  Diffusive density at Zlb */
  db14 = pdm[6][0]*exp(g14)*pd[7][0];
        /*   Diffusive density at Alt */
  output->d[7]=densu(z,db14,tinf,tlb,14.,alpha[7],&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
  dd=output->d[7];
  if ((flags->sw[15]) && (z<=altl[7])) {
    /*   Turbopause */
    zh14=pdm[6][2];
    /*  Mixed density at Zlb */
    b14=densu(zh14,db14,tinf,tlb,14.-xmm,alpha[7]-1., &output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    /*  Mixed density at Alt */
    dm14=densu(z,b14,tinf,tlb,xmm,0.,&output->t[1],ptm[5],s,mn1,zn1,meso_tn1,meso_tgn1);
    zhm14=zhm28;
    /*  Net density at Alt */
    output->d[7]=dnet(output->d[7],dm14,zhm14,xmm,14.);
    /*   Correction to specified mixing ratio at ground */
    rl=log(b28*pdm[6][1]*sqrt(pdl[0][2]*pdl[0][2])/b14);
    hc14=pdm[6][5]*pdl[0][1];
    zc14=pdm[6][4]*pdl[0][0];
    output->d[7]=output->d[7]*ccor(z,rl,hc14,zc14);
    /*   Chemistry correction */
    hcc14=pdm[6][7]*pdl[0][4];
    zcc14=pdm[6][6]*pdl[0][3];
    rc14=pdm[6][3]*pdl[0][5];
    /*  Net density corrected at Alt */
    output->d[7]=output->d[7]*ccor(z,rc14,hcc14,zcc14);
  }


        /**** Anomalous OXYGEN DENSITY ****/

  g16h = flags->sw[21]*globe7(pd[8],input,flags);
  db16h = pdm[7][0]*exp(g16h)*pd[8][0];
  tho = pdm[7][9]*pdl[0][6];
  dd=densu(z,db16h,tho,tho,16.,alpha[8],&output->t[1],ptm[5],s,mn1, zn1,meso_tn1,meso_tgn1);
  zsht=pdm[7][5];
  zmho=pdm[7][4];
  zsho=scalh(zmho,16.0,tho);
  output->d[8]=dd*exp(-zsht/zsho*(exp(-(z-zmho)/zsht)-1.));


  /* total mass density */
  output->d[5] = 1.66E-24*(4.0*output->d[0]+16.0*output->d[1]+28.0*output->d[2]+32.0*output->d[3]+40.0*output->d[4]+ output->d[6]+14.0*output->d[7]);



  /* temperature */
  z = sqrt(input->alt*input->alt);
  densu(z,1.0, tinf, tlb, 0.0, 0.0, &output->t[1], ptm[5], s, mn1, zn1, meso_tn1, meso_tgn1);
  if (flags->sw[0]) {
    for(i=0;i<9;i++)
      output->d[i]=output->d[i]*1.0E6;
    output->d[5]=output->d[5]/1000;
  }
}


//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds

void MSIS::Debug(int from)
{
  if (debug_lvl <= 0) return;

  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: MSIS" << endl;
    if (from == 1) cout << "Destroyed:    MSIS" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 32) { // Turbulence
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
    }
  }
}



} // namespace JSBSim

